content: /*
   * Copyright (C) 2015-present, Ant Financial Services Group
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * 	http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alipay.hulu.common.utils;
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.Socket;
  import java.net.UnknownHostException;
  
  import javax.net.ssl.SSLSocket;
  import javax.net.ssl.SSLSocketFactory;
  
  /**
   * Enables TLS v1.2 when creating SSLSockets.
   * <p/>
   * For some reason, android supports TLS v1.2 from API 16, but enables it by
   * default only from API 20.
   * @link https://developer.android.com/reference/javax/net/ssl/SSLSocket.html
   * @see SSLSocketFactory
   */
  public class Tls12SocketFactory extends SSLSocketFactory {
      private static final String[] TLS_V12_ONLY = {"TLSv1.2"};
  
      final SSLSocketFactory delegate;
  
      public Tls12SocketFactory(SSLSocketFactory base) {
          this.delegate = base;
      }
  
      @Override
      public String[] getDefaultCipherSuites() {
          return delegate.getDefaultCipherSuites();
      }
  
      @Override
      public String[] getSupportedCipherSuites() {
          return delegate.getSupportedCipherSuites();
      }
  
      @Override
      public Socket createSocket(Socket s, String host, int port, boolean autoClose) throws IOException {
          return patch(delegate.createSocket(s, host, port, autoClose));
      }
  
      @Override
      public Socket createSocket(String host, int port) throws IOException, UnknownHostException {
          return patch(delegate.createSocket(host, port));
      }
  
      @Override
      public Socket createSocket(String host, int port, InetAddress localHost, int localPort) throws IOException, UnknownHostException {
          return patch(delegate.createSocket(host, port, localHost, localPort));
      }
  
      @Override
      public Socket createSocket(InetAddress host, int port) throws IOException {
          return patch(delegate.createSocket(host, port));
      }
  
      @Override
      public Socket createSocket(InetAddress address, int port, InetAddress localAddress, int localPort) throws IOException {
          return patch(delegate.createSocket(address, port, localAddress, localPort));
      }
  
      private Socket patch(Socket s) {
          if (s instanceof SSLSocket) {
              ((SSLSocket) s).setEnabledProtocols(TLS_V12_ONLY);
          }
          return s;
      }
  }